Please help. Having a hard time figuring out

c)as speed changes, wavelength and frequency change.

everything changes!

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27

answer; how far out of place which the object finished relative to the starting location;

a skateboard rolling across the street - apex